cs7410 Cirrus Logic, Inc., cs7410 Datasheet - Page 29

• Manufacturer Part Number: cs7410
• Description: Cd/mp3/wma Audio Controller
• Manufacturer: Cirrus Logic, Inc.

4.5
DS553PP3
ROM/NVRAM Interface
The ROM/NVRAM Interface pins are described in
memory that contains the firmware. The memory could be ROM, NVRAM (FLASH), EEPROM, or any com-
bination of these memory types. This interface can also connect to SRAM that would emulate a ROM on a
development system. The bus width is always 8 bits. Most of these pins are shared with the DRAM interface,
which operates simultaneously with the ROM/NVRAM interface. A number of pins are defined to accept con-
figuration input at power-up (see
uration resistor is required on pin PCM_DO_0 to select whether the processor will boot from internal or
external ROM .
11, 13, 15, 20,
21, 22, 23, 24
25, 26, 27, 28,
29, 30, 31, 32,
33, 34, 35, 36
3, 4, 5, 6, 7, 8,
9, 10
46
41
47
48
Pin
NVMem Data[7..0]
NVM_Addr[11..0]
NVM_Addr[19..12]
NVM_Addr[20]
NVM_WE_L
NVM_OE_L
NVM_CE_L
Signal Name
Table
Table 12. ROM/NVRAM Interface
7), allowing different branches to be taken in the firmware. A config-
Type
O
B
O
O
O
O
O
Memory Data Bus (shared with bits [7:0] of DRAM data
bus).
Memory Address Bus[11..0] (shared with DRAM
address bus)
Memory Address Bus[19..12] (shared with bits [15..8] of
DRAM data bus).
Memory Address Bus[20] (DRAM BS_L pin).
NVRAM Write Enable (shared with DRAM WE_L pin)
NVRAM Write Enable (shared with DRAM WE_L pin)
ROM/NVRAM Chip Enable.
Table
12. This interface connects to the non-volatile
Description
CS7410
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